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Key self-host auth rate limit on the real client IP - #2053
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RhysSullivan wants to merge 3 commits into
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RhysSullivan wants to merge 3 commits into
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executor-marketing | d486c2b | Commit Preview URL Branch Preview URL |
Sep 18 2026, 07:36 PM |
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Cloudflare previewTorn down — the PR is closed. |
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executor-cloud | d486c2b | Sep 18 2026, 07:37 PM |
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We're clearing the backlog ahead of the v2 launch, so we're closing this. If it still applies to v2, please open a new issue or PR against v2. Sent from my Claude |
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Better Auth's rate limiter only reads the client IP from headers, so a directly exposed self-host pooled every user into one sign-in bucket (3 per 10 s).
x-executor-client-ipbefore Better Auth sees the request, always overwriting any client-supplied value. Direct deployments get per-client limiting with no configuration.EXECUTOR_TRUSTED_PROXY_HEADER+EXECUTOR_TRUSTED_PROXIESfor reverse proxies (Caddy, nginx, Cloudflare). The proxy header is honoured only on connections from a listed address and stripped otherwise. Half-configured or malformed values refuse to boot.x-forwarded-foris no longer read on its own (any client could rotate it). A proxied instance shares one bucket until both variables are set; the server logs one warning naming them when an auth request carries a proxy-style header and no trusted proxy is configured..env.exampleshow the proxy's own address (172.18.0.2, or its compose network) rather than a broad private range: if every hop is trusted Better Auth finds no client and falls back to one bucket. The Docker note distinguishes Linux iptables NAT (client IP preserved) from Docker Desktop and loopback traffic via the userland proxy.clientIpAddressOptionsbuilds theadvanced.ipAddressblock and is unit-tested; stamper tests cover the once-only warning..env.example, config tests, stamper unit tests, changeset.